// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [RawAutocomplete].

void main() => runApp(const AutocompleteExampleApp());

class AutocompleteExampleApp extends StatelessWidget {
  const AutocompleteExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: const Text('RawAutocomplete Custom Type')),
        body: const Center(child: AutocompleteCustomTypeExample()),
      ),
    );
  }
}

// An example of a type that someone might want to autocomplete a list of.
@immutable
class User {
  const User({required this.email, required this.name});

  final String email;
  final String name;

  @override
  String toString() {
    return '$name, $email';
  }

  @override
  bool operator ==(Object other) {
    if (other.runtimeType != runtimeType) {
      return false;
    }
    return other is User && other.name == name && other.email == email;
  }

  @override
  int get hashCode => Object.hash(email, name);
}

class AutocompleteCustomTypeExample extends StatelessWidget {
  const AutocompleteCustomTypeExample({super.key});

  static const List<User> _userOptions = <User>[
    User(name: 'Alice', email: 'alice@example.com'),
    User(name: 'Bob', email: 'bob@example.com'),
    User(name: 'Charlie', email: 'charlie123@gmail.com'),
  ];

  static String _displayStringForOption(User option) => option.name;

  @override
  Widget build(BuildContext context) {
    return RawAutocomplete<User>(
      optionsBuilder: (TextEditingValue textEditingValue) {
        return _userOptions.where((User option) {
          // Search based on User.toString, which includes both name and
          // email, even though the display string is just the name.
          return option.toString().contains(textEditingValue.text.toLowerCase());
        });
      },
      displayStringForOption: _displayStringForOption,
      fieldViewBuilder:
          (
            BuildContext context,
            TextEditingController textEditingController,
            FocusNode focusNode,
            VoidCallback onFieldSubmitted,
          ) {
            return TextFormField(
              controller: textEditingController,
              focusNode: focusNode,
              onFieldSubmitted: (String value) {
                onFieldSubmitted();
              },
            );
          },
      optionsViewBuilder:
          (BuildContext context, AutocompleteOnSelected<User> onSelected, Iterable<User> options) {
            return Align(
              alignment: Alignment.topLeft,
              child: Material(
                elevation: 4.0,
                child: SizedBox(
                  height: 200.0,
                  child: ListView.builder(
                    padding: const EdgeInsets.all(8.0),
                    itemCount: options.length,
                    itemBuilder: (BuildContext context, int index) {
                      final User option = options.elementAt(index);
                      return GestureDetector(
                        onTap: () {
                          onSelected(option);
                        },
                        child: ListTile(title: Text(_displayStringForOption(option))),
                      );
                    },
                  ),
                ),
              ),
            );
          },
    );
  }
}
